Engineering and Contracting . s at the collar of the shaft. The shaft was sunk through quicksand at a rateof Syi to 9j2 ft. per month, work be-ing carried on continuously, except Sun-days. Water Level Gage.—In the testinguf deep wells one of the most trouble-some operations often is the measure-ment of the lift when the pump is oper-ating. An observation of the waterlevel w-hen the pump is not running willnot suffice, as in operation the waterlevel may fall away in a very consid-erable amount. An electric device de-pending upon an insulated wire droppedinto the well which closes a circuitwith
Engineering and Contracting . s at the collar of the shaft. The shaft was sunk through quicksand at a rateof Syi to 9j2 ft. per month, work be-ing carried on continuously, except Sun-days. Water Level Gage.—In the testinguf deep wells one of the most trouble-some operations often is the measure-ment of the lift when the pump is oper-ating. An observation of the waterlevel w-hen the pump is not running willnot suffice, as in operation the waterlevel may fall away in a very consid-erable amount. An electric device de-pending upon an insulated wire droppedinto the well which closes a circuitwith the well casing when the waterlevel is touched, is sometimes usedwhere there is sufficient space betweenthe casing and water pipe. Often times,,however, this space is not available. Ina paper by Mr. Charles B. Burdick, readbefore the Western Society of Engi-neers, and printed in the journal of thesociety, is described the accompanying-device which has been used for the abovepurpose for ten years or more. The .^yfe/c* Casing. A/°/ Ai? Device for Measuring Water Level. device consists of a small pipe (J4 do), or valve, and a pressure gageso graduated that it can be read to 1lb. or less. A known length of pipe isdropped into the well; air pressure isthen applied until the water is drivenfrom the pipe, as evidenced by the re-fusal of the gage to rise further. Thispressure reduced to feet shows theamount of submergence of the end ofthe pipe. The accompanying cut showsthe arrangement coupled to an air liftpump. In No. 1 of the figure is shownan application to a case where the ex-terior of the water pipe is an air lift when this can be donethe compressed air can be obtained bytapping the air pipe. No. 2 shows anapplication to an air lift where there isno room outside, and with this arrange-ment a hand air pump is desirable asthe pressure required in the test pipe isa little in excess of that in the air ordinary beer pump or large bicy-cle air pump a
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherchicago, bookyear19
